/**
*  Copyright (c) 2011, Alex Theodoridis
*  All rights reserved.

*  Redistribution and use in source and binary forms, with
*  or without modification, are permitted provided that the
*  following conditions are met:
*  Redistributions of source code must retain the above
*  copyright notice, this list of conditions and the following disclaimer.
*  Redistributions in binary form must reproduce the above
*  copyright notice, this list of conditions and the following
*  disclaimer in the documentation and/or other materials
*  provided with the distribution.

*  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS
*  AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
*  INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
*  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
*  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
*  ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
*  OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
*  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
*  OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
*  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
*  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
*  ANY WAY OUT OF THE USE OF THIS SOFTWARE,
*  EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE
*/

#ifndef IEQUATIONFACTORY_H_
#define IEQUATIONFACTORY_H_

namespace nn {

    /**
     * Equation factory interface.
     * An implementation of the current interface
     * should generate the valid instance \see={IEquation}
     * interface implementation.
     */
    template<class Var>
    class IEquationFactory {
    public:
        /**
         * Empty constructor.
         */
        IEquationFactory ( void ){}

        /**
         * Destructor.
         */
        virtual ~IEquationFactory ( void ){}

    public:
        /**
         *	The implementation of current method
         *	should return the implementation of \see { IEquation } interface.
         */
        virtual IEquation<Var>* getInstance ( void ) const = 0;
    };
}

#endif /* IEQUATIONFACTORY_H_ */
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